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Article: Stability and Mixing of a Vertical Axisymmetric Buoyant Jet in Shallow Water

TitleStability and Mixing of a Vertical Axisymmetric Buoyant Jet in Shallow Water
Authors
Issue Date2006
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=1567-7419
Citation
Environmental Fluid Mechanics, 2006, v. 6 n. 2, p. 153-180 How to Cite?
AbstractThe stability, mixing and effect of downstream control on axisymmetric turbulent buoyant jets discharging vertically into shallow stagnant water is studied using 3D Reynolds-averaged Navier–Stokes equations (RANS) combined with a buoyancy-extended k –ε model. The steady axisymmetric turbulent flow, temperature (or tracer concentration) and turbulence fields are computed using the finite volume method on a high resolution grid. The numerical predictions demonstrate two generic flow patterns for different turbulent heated jet discharges and environmental parameters (i) a stable buoyant discharge with the mixed fluid leaving the vertical jet region in a surface warm water layer; and (ii) an unstable buoyant discharge with flow recirculation and re-entrainment of heated water. A stratified counterflow region always appears in the far-field for both stable and unstable buoyant discharges. Provided that the domain radius L exceeds about 6H, the near field interaction and hence discharge stability is governed chiefly by the jet momentum length scale to depth ratio l M /H, regardless of downstream control. The near field jet stability criterion is determined to be l M /H = 3.5. A radial internal hydraulic jump always exists beyond the surface impingement region, with a 3- to 6-fold increase in dilution across the jump compared with vertical buoyant jet mixing. The predicted stability category, velocity and temperature/concentration fields are well-supported by experiments of all previous investigators.
Persistent Identifierhttp://hdl.handle.net/10722/71700
ISSN
2015 Impact Factor: 1.394
2015 SCImago Journal Rankings: 0.585

 

DC FieldValueLanguage
dc.contributor.authorKuang, Cen_HK
dc.contributor.authorLee, JHWen_HK
dc.date.accessioned2010-09-06T06:34:22Z-
dc.date.available2010-09-06T06:34:22Z-
dc.date.issued2006en_HK
dc.identifier.citationEnvironmental Fluid Mechanics, 2006, v. 6 n. 2, p. 153-180en_HK
dc.identifier.issn1567-7419en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71700-
dc.description.abstractThe stability, mixing and effect of downstream control on axisymmetric turbulent buoyant jets discharging vertically into shallow stagnant water is studied using 3D Reynolds-averaged Navier–Stokes equations (RANS) combined with a buoyancy-extended k –ε model. The steady axisymmetric turbulent flow, temperature (or tracer concentration) and turbulence fields are computed using the finite volume method on a high resolution grid. The numerical predictions demonstrate two generic flow patterns for different turbulent heated jet discharges and environmental parameters (i) a stable buoyant discharge with the mixed fluid leaving the vertical jet region in a surface warm water layer; and (ii) an unstable buoyant discharge with flow recirculation and re-entrainment of heated water. A stratified counterflow region always appears in the far-field for both stable and unstable buoyant discharges. Provided that the domain radius L exceeds about 6H, the near field interaction and hence discharge stability is governed chiefly by the jet momentum length scale to depth ratio l M /H, regardless of downstream control. The near field jet stability criterion is determined to be l M /H = 3.5. A radial internal hydraulic jump always exists beyond the surface impingement region, with a 3- to 6-fold increase in dilution across the jump compared with vertical buoyant jet mixing. The predicted stability category, velocity and temperature/concentration fields are well-supported by experiments of all previous investigators.-
dc.languageengen_HK
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=1567-7419en_HK
dc.relation.ispartofEnvironmental Fluid Mechanicsen_HK
dc.titleStability and Mixing of a Vertical Axisymmetric Buoyant Jet in Shallow Wateren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1567-7419&volume=6&issue=2&spage=153&epage=180&date=2006&atitle=Stability+and+mixing+of+a+vertical+axi-symmetric+buoyant+jet+in+shallow+depthen_HK
dc.identifier.emailKuang, C: cpkuang@tongji.edu.cnen_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s10652-006-0001-5-
dc.identifier.hkuros118047en_HK

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